JPH0450187B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tension adjustment device in a printing press,
More specifically, the tension of the paper feed inside the printing unit from the pull-out roll provided in the paper feed unit to the intermittent pull roll is adjusted.

Conventionally, the tension reaching the printing section is determined by using a stepped roll installed in the paper feed section without placing any weight on it.
After 50 st/min, it becomes unable to follow the movement of the paper and changes to an impact load. Therefore, in order to compensate for this drawback, a roll with a powder brake is installed between the paper feed section and the printing machine to absorb the impact of the step roll, and is also used to set the tension between the paper feed pull rolls. Yes, but 60st/min,
As the speed increases to 70st/min, the accuracy of the product begins to be slightly affected.

Therefore, the present invention aims to solve the above-mentioned conventional drawbacks, and provides tension by providing a back tension roll that is constantly rotated in reverse by a servo motor equipped with a powder clutch between the immediate pull roll and the intermittent pull roll. This improves product accuracy by eliminating sagging in the paper feed section.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tension adjustment device for a printing press according to the present invention will be described in detail below with reference to the accompanying drawings.

Reference numeral 1 denotes a printing machine in which a paper feeding section 2 and a printing section 3 are arranged in series.The paper feeding section 2 is provided with a bearing 5 that supports the roll paper 4, and in front of the paper roll 4 is a pull-out roll 7 that passes through a guide roll 6. It is installed on a shaft.

A reversing tension roll 8 is installed at the leading end of the paper feed section 2.
A step roll 1 provided on the swing arm 9 is disposed between the tension roll 8 and the pull-out roll 7.
0 is set.

The shaft 8' of the tension roll 8 is connected to a servo motor 12 via a powder clutch 11. The servo motor 12 always rotates in reverse and the clutch 11
When it is turned on, the tension roll 8 is transmitted.

The pull-out roll 7 is synchronized with the printing section using a pulse motor.

In the drawing, the offset section 3 has two colors, and the plate cylinder 13,
14, a plan cylinder 15, and an impression cylinder 16 are arranged, and the impression cylinder 1
Before and after the roller 6, guide rolls 17 and 18 are used to guide the feeding paper passing over the impression cylinder 16 so as not to get caught. The blank cylinder 15 and the impression cylinder 16 are intermittently pulled out by a pull roll 19 provided on the front end side of the printing section 3, and printing is performed while the printing section 3 is stopped. Further, a pair of swinging rolls 20 and 21 are provided between the pulling roll 19 and the reversing tension roll 8, and the swinging roll 20 is moved while the paper is stopped on the pulling roll 19 to match the circumferential speed of the bread cylinder 15. It is designed so that it can be swung and printed. In addition, the looseness and misalignment that occurred between the swinging roll 20 and the reversing tension roll 8,
Adjustment is made by reversing the tension roll 8 described above.

The pulling roll 19 is driven by a pulse motor 22 to pull the paper with a paper pulling time commensurate with each stroke. The instant pulse motor 22 determines the printing length, and the operating time of the motor 22 is determined by the number of pulses.
It is set to 5.

The pulses of the motor 22 of the intermittent pulling roll 19 are determined by an encoder 23 arranged at the front of the pulling roll 19.
Set with .

The present invention has the above-mentioned configuration, in which the roll paper 4 supported by the paper feed section 2 is pulled out by the pull-out roll 7 through the guide roll 6, and is further drawn out by the dancer roll 10 and the tension roll 8.
The paper is then intermittently pulled out by an intermittent pull roll 19 placed at the tip of the printing section 3, and while the paper is stopped, it is moved by an oscillating roll 20 in accordance with the circumferential speed of the blank cylinder 15, during which time it is guided to the impression cylinder 16. printed paper (printing paper)
is printed on the blank cylinder 15.

Also, if the base paper pulled from the pull roll 7 by the pull roll 19 changes in tension due to the operation of the swing roll, the powder clutch of the servo motor, which is constantly rotating in reverse, is input to reverse the tension roll 8. It adjusts to the set tension and provides tension, and can prevent unruliness due to loosening during printing.

As mentioned above, in a printing machine consisting of a paper feed section and a printing section, a reversing tray is connected via a servo motor that rotates in reverse and a powder clutch between the oscillating roll installed in the printing section and the pull-out roll of the paper feed section. This is a tension adjustment device for a printing press that has a tension roll interposed therein, and since a reversing tension roll is used, the looseness that occurs between the swinging rolls swinging from the pull-out roll can be corrected by inserting a powder clutch into the tension adjustment device. The tension is adjusted to the set tension by rotating the roll 8 in the reverse direction, and there is no unruliness due to sag, which improves printing accuracy.

[Brief explanation of the drawing]

The drawings show an embodiment of the tension adjustment device in a printing press according to the present invention, and FIG. 1 is a side view;
FIG. 2 is a sectional view of the tension roll. 1 - Printing machine, 2 - Paper feeding section, 3 - Printing section, 4 - Rolling paper, 5 - Bearing, 6 - Guide roll, 7 - Drawer roll, 8 - Tension roll, 8' - Shaft, 9 - Swinging Arm, 10-step roll, 11-powder clutch, 12-servo motor, 13, 14-plate cylinder, 1
5 - blank cylinder, 16 - impression cylinder, 17, 18 - guide roll, 19 - pull roll, 20, 21 - swing roll, 22 - pulse motor, 23 - encoder.

Claims (1)

[Claims] 1. In a printing machine equipped with a continuous base paper receiving section, a paper feeding section equipped with a pull-out roll, and a step roll, and a printing section equipped with an impression cylinder, a blank cylinder, and a plate cylinder, the leading end side of the printing section is An intermittent pull roll driven by a pulse motor is provided, as well as a pair of swing rolls that swing in accordance with the circumferential speed of the blank cylinder and plate cylinder. A tension adjustment device for a printing press characterized by a tension roll that is connected to a rotating servo motor and a powder clutch to adjust the sag while changing the amount of reverse tension.